CVE-2025-21739

Stale memory access via delayed crypto cleanup

Published Feb 27, 2025 · Updated Jun 1, 2026

Use-after-free in the Linux UFS core driver from 5.12 allows local users to trigger stale memory access during device teardown. ufshcd_dealloc_host() releases struct ufs_hba before the platform device invokes its registered crypto-profile cleanup callback. Reaching the path requires root, CAP_SYS_ADMIN, or CAP_SYS_MODULE; the callback then accesses the released crypto profile.

CVSS severity7.8
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux UFS core driver from 5.12 allows local users to trigger stale memory access during device teardown. ufshcd_dealloc_host() releases struct ufs_hba before the platform device invokes its registered crypto-profile cleanup callback. Reaching the path requires root, CAP_SYS_ADMIN, or CAP_SYS_MODULE; the callback then accesses the released crypto profile.

The record

CVE
CVE-2025-21739
Published
Feb 27, 2025
Updated
Jun 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Feb 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.12
  2. Affected versionversion=d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350 <0a6895c03b1f439236e2d22b1a69ebfc1eb9d5ea
  3. Affected versionversion=d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350 <0c77c0d754fe83cb154715fcfec6c3faef94f207
  4. Affected versionversion=d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350 <0dc539b888fb5f56b6eeddd95433eab557d4b0c1
  5. Affected versionversion=d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350 <9c185beae09a3eb85f54777edafa227f7e03075d
  6. Affected versionversion=d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350 <d06eb2620d3bf16056b8b7ea3744dbb5e30512f4
  7. Affected versionversion=d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350 <f8fb2403ddebb5eea0033d90d9daae4c88749ada

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=5.12; version=d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350 <0a6895c03b1f439236e2d22b1a69ebfc1eb9d5ea; version=d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350 <0c77c0d754fe83cb154715fcfec6c3faef94f207; version=d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350 <0dc539b888fb5f56b6eeddd95433eab557d4b0c1; version=d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350 <9c185beae09a3eb85f54777edafa227f7e03075d; version=d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350 <d06eb2620d3bf16056b8b7ea3744dbb5e30512f4; version=d76d9d7d1009968dd3a0fc30e5f5ee9fbffc1350 <f8fb2403ddebb5eea0033d90d9daae4c88749ada

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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